Portable and easy to use The chainsaw round files are portable and simple tools that do not require any power or air source. This makes them ideal for outdoor logging operations, allowing sharpening on the go. Multiple model matching Different diameter options are available for your needs: The 0mm diameter is suitable for electric small 3/8 chain saw grinding. The 4.8mm diameter is suitable for small 325 and large 3/8 fuel saw grinding. The 5.5mm diameter is suitable for large 404 fuel saw grinding. Important grinding safety During grinding, follow proper technique. Always grind in the recommended direction and avoid repeated push and pull grinding, as it may damage the blade edge. We prioritize safety and the longevity of your chainsaw. Lasting construction Our chainsaw round files are made of tool steel for durability and longlasting performance. The handle is made of sturdy plastic material for a comfortable grip and ease of use. Use scenarios Field maintenance on outdoor work sites: sharpen chains on the job without power or air sources. Workshop maintenance: perform routine chain sharpening for various saw sizes in a setting. Emergency or remote repairs: conduct quick touchups to restore cutting performance when away from power tools.